Three-circuit coupler



Patented Febe 9, i925;

Application lied To all eli/tom t may concern with an Be it known that l, larfrnn l. Plinn, citizen of United States? at New York city, in the county Yori; rind State of New York, .have if certain new and useful linproveiu Three-Circuit Couplers, of which lowing` a specification. i Y iave a num ei This invention relates `generally to radio tlierei'o to re nivo the usua G5 apparatus, having incre pzi 'ticuler reference noctions to a novel varie-.ble coupler which inserted between tbe antenna and 'tliedetector circuit in radio receiver5 and vfliicli l terni a tlirce circuit coupler.

The invention lies for en objc-ct to a variable coupler Wliicli is Pe l tbe innci e clips.

formed 1with bori- 1'li which extends i extends else Y and Wbicli lias provi dc nsitiife than those now in use and )rejects an :L 'cw of greater selectivity in reces ,i inside tire rin- For furtliei coinpieliensioi and is feste-ced 75 tion, and of the objects and screw: sin-,li :is thereof, reference will be inl :gli this hollow ing descriptionani accor-.npanying` drawing. rod 3C' wziicli and to the appended claiins iA- ivliicli 'the s inner end 'tlic various novel features of tlie invention are beyond the liol- 80 more particulnrly set forth. 'die l i Fig. l of the drawing is a side fi r i "x iny improved variable coupler sliovvii position on the panel a receiving` s Fig. Qiis an axial vertical sectional of the coupler.

i' l .C A. liig. 3 is i apnientaiy tional View talon on tlie l Y Fig. tis a fiaginentary elevati c s looking in the direction of tlie tl lo and ln Fie' 2 d t., Fig'. 5 is a detail sectional vieiv snowing; o

a niodined ineans ior releasably coA ne the tivo variable coil supports together.

As here embodied iny improved coupler comprises tliree coils arranged concentric to one anotlier7 these coils being' indicated at t l0, ll and l2, respectively and being Wou it 'ed d on on the short tubes or rings l0, ll and 12, knob c l which rings may be made of i'ibre or like with a i ig insulating material. These tubes are under parallel to of tlie s1 cut, or formed With shallow circumferential Wliicli i s grooves as shown to re eive the coils ail S tlie spindle prevent displacement thereof. rllliese rings of said oi' tubes are adapted to be inounted on the 105 panel board of the receiver vliicli Liaiiel board is indicated at lll, with their coiiinon and rod.

axis obliquely inclined with respect to tlie v.' f C' ready loosening` of said panel board, preferably at an of v t to tlie spindle? l inay provino forty-five degrees. F Xed this panel board the following novel frictienal coniection u() e rod 80 is a bracket 16 which may be secured to tlie between tl e spin` panel board by a scieu7 17 passing` tliei'etherein from the outer lnd thereof, in which is slidable a plunger pin lf3 which has projecting from its inner end portion a pair of fins la which extend through longitudinal slots 45 in the rod 230 and engage in a truste-conical recess etti in ihe hollow spindle 25. These fins are norinal ly pressed against the inclined wall of the said recess by means of an expansion spring 47 which bears against a knob or head fifi on the outer end of the pin a3, this spring being located in a socket in the knob S9. It

will be obvious that by pushing the pin all' inward the fins ,illiare loosened from their gripping action on the. hollow spindle 25, permitnng the rod to be ro `ated freely in said spindle to adjust the inner coil l2.

The fixed coil l0 is the primary coil and may be provided with eight unit and eight group taps, while the intermediate coil ll constitutes the secondary, and the inner coil a tickler. In the winding these coils the number of turns of wire on each coil is directly proportioned according to the wave length desired.

I have found that by means of my iinproved variable coupler the receiver is mad-e nore sensitive, and can be adjusted with greater selectivity to different stations.

Having thus described my invention, what I claim niw and desire to protect by Letters Tatent of the United States is as follows:-

1. In a radio set, a 'frame element including a bracket, a fixed coupler coil mountsr1 on said bracket, a hollow spindle rotatably mounted in said bracket, an adjustable coil fixed on one end of said spindle and positioned within the said fixed coil, a rod extending freely through the said hollow spindle, and a second adjustable coil fixed on one end of said rod and positioned within the first mentioned adjustable coil, and a releasable friction device preventing relative rotation of said rod and spindle.

2. In a radio set, a frame element including a bracket, a fixed coupler coil mounted on said bracket, a hollow spindle rotatably mounted in said bracket, an adjustable coil fixed on one end of said spindle and positioned within the said fixed coil, a rod extending` freely through the said hollow spindle, and a second adjustable coil fix d on one end et said rod and positioned within the first mentioned adjustable coil, and a releasable friction device preventing relative rotation of said rod and spindle, said friction device comprising pin slidable in an axial boring in said rod and formed on its inner end with a laterally projecting fin projecting into a frusto-conical recess in the hollow spindle, and a spring bearing on said pin to hold the latter in position with the fin thereon wedged against the wall of the said reces.

In a radio set, a bracket, a fixed coupl r coil mounted in said bracket, a hollow spindle rotatably mounted in said bracket, an adjustable coil fixed on one end of' said spindle and positioned within said fixed coil, a rod extending 'freely through said hollow spindle, and a second adjustable coil .fixed on one end of said rod and positioned within f id first mentioned adjustable coil, said first named coil constituting the primary coil, the intermediate coil constituting the secondary coil, and the inner coil constituting a tickler, and a rel asable friction device for preventing relative rotation of said rod and spindle, said device coinprising a pin in said rod, fins on said pin engaging said spindle, and a means bearing on said pin for holding it in position with the fins wedged in said spindle.

il. In a radio set, a bracket, a fixed priinary coupler coil mounted on said bracket, a hollow tpindle rotatably inoilnted in said bracket, having a truste-conical rec ss, a knob on said spindle, and an adjustable secondary coil fixed on one end oit' said spindle, and positioned within said fixed coil, a rod extending` freely through the faid hollow spindle having an axial bore and longitudinal slots, a knob ou the projecting outer end of said rod having a socket formed therein, a second adjustable coil constituting a t-icltler fixed on one end of said rod, and position d within the first mentioned adjustaile coil, a plunger pin z-lidable in the axial bore ofl said rod, a head on said pin, a pair of fins projecting from the inner end portion of said pin and extending through the longitudinal slots of said rod, said fins adapted to engage the truste-conical recess in said spindle, an expansion spring within the socket of said rod knobA bearing against the head on said pin for pressing said fins against the inclined wall ot the frusto-conical rcess for normally allowing a rotation of said rod with said spindle, permitting an inward movement of said pin to allow the rod to freely rotate in said spindle to adjust the inner coil.

In testimony whereofl I have aflixed my signature.

WALTER B. SCHOEPPLER. 

